土壤2024，Vol.56Issue(6)：1319-1325,7.DOI:10.13758/j.cnki.tr.2024.06.020
不同钝化剂对土壤砷吸附解吸的影响
Effects of Different Passivators on Adsorption and Desorption of Arsenic in Soil
摘要
Abstract
In order to screen out high efficiency passivating agent of arsenic(As)in soil contaminated by heavy metals,the effects of four passivating agents,maize straw biochar(MBC),peanut shell biochar(PBC),attapulgite(ATP)and hydroxyapatite(HAP),on adsorption and desorption of As in soil were investigated by the batch test.The results showed that passivators significantly increased the adsorption amount and adsorption rate of As in soil(P＜0.05)with an order of HAP＞ATP＞PCB＞MBC＞CK.Langmuir equation was better for the isothermal sorption curve(P＜0.01).The four passivators increased the maximum adsorption amount and binding strength of As in soil,and the maximum adsorption amount followed the order of ATP＞PBC＞MBC＞HAP＞CK.Adsorption-desorption test indicated the adsorption kinetic curves of As could be described well by the Elovich equation(P＜0.01),and HAP and ATP had better adsorption effect,but the desorption amount of HAP was 25.0％-86.3％higher than that of ATP.Therefore,from the perspective of adsorption and desorption,ATP is a better passivating agent for As in soil.关键词
砷/钝化剂/吸附/解吸/吸附动力学Key words
Arsenic/Passivator/Adsorption/Desorption/Adsorption kinetics分类
资源环境引用本文复制引用
李仁英,全红,李绍通,刘雨霏,简静,李玉聪,芦文皓,段盛芹,普布次松..不同钝化剂对土壤砷吸附解吸的影响[J].土壤,2024,56(6):1319-1325,7.基金项目
江苏省林业科技创新与推广项目(LYKJ[2019]08)和江苏省研究生科研与实践创新计划项目资助. （LYKJ[2019]08）
